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Abstract
A novel blue-green light-emitting cationic iridium complex [Ir(ppz)2pzpy]PF6 (complex 1), where ppz is phenylpyrazole and pzpy is 2-(1-phenyl-1H-pyrazol-3-yl)pyridine, is developed. Its crystal, photophysical and electrochemical properties are characterized through experiments and quantum chemical calculations. The novel complex exhibits enlarged energy gap and blue-shifted emission spectrum at 77K compared to a reference complex, [Ir(ppy)2pzpy]PF6 (complex 2), with phenylpyridine (ppy) as the cyclometalated ligands. Moreover, light-emitting electrochemical cells (LECs) fabricated with complex 1 show both improved color purity with CIE (Commission Internationale de L’Eclairage) coordinates of (0.25, 0.39) and elongated lifespan (t1/2=218min, Etot=0.55mJ) compared to LECs based on complex 2.
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